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1da177e4 LT |
1 | /* |
2 | * pci_root.c - ACPI PCI Root Bridge Driver ($Revision: 40 $) | |
3 | * | |
4 | * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> | |
5 | * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> | |
6 | * | |
7 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License as published by | |
11 | * the Free Software Foundation; either version 2 of the License, or (at | |
12 | * your option) any later version. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, but | |
15 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
17 | * General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License along | |
20 | * with this program; if not, write to the Free Software Foundation, Inc., | |
21 | * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. | |
22 | * | |
23 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
24 | */ | |
25 | ||
26 | #include <linux/kernel.h> | |
27 | #include <linux/module.h> | |
28 | #include <linux/init.h> | |
29 | #include <linux/types.h> | |
30 | #include <linux/proc_fs.h> | |
31 | #include <linux/spinlock.h> | |
32 | #include <linux/pm.h> | |
33 | #include <linux/pci.h> | |
990a7ac5 | 34 | #include <linux/pci-acpi.h> |
1da177e4 LT |
35 | #include <linux/acpi.h> |
36 | #include <acpi/acpi_bus.h> | |
37 | #include <acpi/acpi_drivers.h> | |
38 | ||
1da177e4 | 39 | #define _COMPONENT ACPI_PCI_COMPONENT |
f52fd66d | 40 | ACPI_MODULE_NAME("pci_root"); |
1da177e4 | 41 | #define ACPI_PCI_ROOT_CLASS "pci_bridge" |
1da177e4 | 42 | #define ACPI_PCI_ROOT_DEVICE_NAME "PCI Root Bridge" |
4be44fcd LB |
43 | static int acpi_pci_root_add(struct acpi_device *device); |
44 | static int acpi_pci_root_remove(struct acpi_device *device, int type); | |
45 | static int acpi_pci_root_start(struct acpi_device *device); | |
1da177e4 | 46 | |
1ba90e3a TR |
47 | static struct acpi_device_id root_device_ids[] = { |
48 | {"PNP0A03", 0}, | |
49 | {"", 0}, | |
50 | }; | |
51 | MODULE_DEVICE_TABLE(acpi, root_device_ids); | |
52 | ||
1da177e4 | 53 | static struct acpi_driver acpi_pci_root_driver = { |
c2b6705b | 54 | .name = "pci_root", |
4be44fcd | 55 | .class = ACPI_PCI_ROOT_CLASS, |
1ba90e3a | 56 | .ids = root_device_ids, |
4be44fcd LB |
57 | .ops = { |
58 | .add = acpi_pci_root_add, | |
59 | .remove = acpi_pci_root_remove, | |
60 | .start = acpi_pci_root_start, | |
61 | }, | |
1da177e4 LT |
62 | }; |
63 | ||
64 | struct acpi_pci_root { | |
4be44fcd | 65 | struct list_head node; |
32917e5b | 66 | struct acpi_device * device; |
4be44fcd LB |
67 | struct acpi_pci_id id; |
68 | struct pci_bus *bus; | |
1da177e4 LT |
69 | }; |
70 | ||
71 | static LIST_HEAD(acpi_pci_roots); | |
72 | ||
73 | static struct acpi_pci_driver *sub_driver; | |
74 | ||
75 | int acpi_pci_register_driver(struct acpi_pci_driver *driver) | |
76 | { | |
77 | int n = 0; | |
78 | struct list_head *entry; | |
79 | ||
80 | struct acpi_pci_driver **pptr = &sub_driver; | |
81 | while (*pptr) | |
82 | pptr = &(*pptr)->next; | |
83 | *pptr = driver; | |
84 | ||
85 | if (!driver->add) | |
86 | return 0; | |
87 | ||
88 | list_for_each(entry, &acpi_pci_roots) { | |
89 | struct acpi_pci_root *root; | |
90 | root = list_entry(entry, struct acpi_pci_root, node); | |
2d1e0a02 | 91 | driver->add(root->device->handle); |
1da177e4 LT |
92 | n++; |
93 | } | |
94 | ||
95 | return n; | |
96 | } | |
4be44fcd | 97 | |
1da177e4 LT |
98 | EXPORT_SYMBOL(acpi_pci_register_driver); |
99 | ||
100 | void acpi_pci_unregister_driver(struct acpi_pci_driver *driver) | |
101 | { | |
102 | struct list_head *entry; | |
103 | ||
104 | struct acpi_pci_driver **pptr = &sub_driver; | |
105 | while (*pptr) { | |
f10bb254 AM |
106 | if (*pptr == driver) |
107 | break; | |
108 | pptr = &(*pptr)->next; | |
1da177e4 | 109 | } |
f10bb254 AM |
110 | BUG_ON(!*pptr); |
111 | *pptr = (*pptr)->next; | |
1da177e4 LT |
112 | |
113 | if (!driver->remove) | |
114 | return; | |
115 | ||
116 | list_for_each(entry, &acpi_pci_roots) { | |
117 | struct acpi_pci_root *root; | |
118 | root = list_entry(entry, struct acpi_pci_root, node); | |
2d1e0a02 | 119 | driver->remove(root->device->handle); |
1da177e4 LT |
120 | } |
121 | } | |
4be44fcd | 122 | |
1da177e4 LT |
123 | EXPORT_SYMBOL(acpi_pci_unregister_driver); |
124 | ||
d91a0078 JC |
125 | acpi_handle acpi_get_pci_rootbridge_handle(unsigned int seg, unsigned int bus) |
126 | { | |
127 | struct acpi_pci_root *tmp; | |
128 | ||
129 | list_for_each_entry(tmp, &acpi_pci_roots, node) { | |
130 | if ((tmp->id.segment == (u16) seg) && (tmp->id.bus == (u16) bus)) | |
131 | return tmp->device->handle; | |
132 | } | |
133 | return NULL; | |
134 | } | |
135 | ||
136 | EXPORT_SYMBOL_GPL(acpi_get_pci_rootbridge_handle); | |
137 | ||
1da177e4 | 138 | static acpi_status |
4be44fcd | 139 | get_root_bridge_busnr_callback(struct acpi_resource *resource, void *data) |
1da177e4 | 140 | { |
50dd0969 | 141 | int *busnr = data; |
1da177e4 LT |
142 | struct acpi_resource_address64 address; |
143 | ||
50eca3eb BM |
144 | if (resource->type != ACPI_RESOURCE_TYPE_ADDRESS16 && |
145 | resource->type != ACPI_RESOURCE_TYPE_ADDRESS32 && | |
146 | resource->type != ACPI_RESOURCE_TYPE_ADDRESS64) | |
1da177e4 LT |
147 | return AE_OK; |
148 | ||
149 | acpi_resource_to_address64(resource, &address); | |
4be44fcd LB |
150 | if ((address.address_length > 0) && |
151 | (address.resource_type == ACPI_BUS_NUMBER_RANGE)) | |
50eca3eb | 152 | *busnr = address.minimum; |
1da177e4 LT |
153 | |
154 | return AE_OK; | |
155 | } | |
156 | ||
4be44fcd | 157 | static acpi_status try_get_root_bridge_busnr(acpi_handle handle, int *busnum) |
1da177e4 LT |
158 | { |
159 | acpi_status status; | |
160 | ||
161 | *busnum = -1; | |
4be44fcd LB |
162 | status = |
163 | acpi_walk_resources(handle, METHOD_NAME__CRS, | |
164 | get_root_bridge_busnr_callback, busnum); | |
1da177e4 LT |
165 | if (ACPI_FAILURE(status)) |
166 | return status; | |
167 | /* Check if we really get a bus number from _CRS */ | |
168 | if (*busnum == -1) | |
169 | return AE_ERROR; | |
170 | return AE_OK; | |
171 | } | |
172 | ||
2786f6e3 RZ |
173 | static void acpi_pci_bridge_scan(struct acpi_device *device) |
174 | { | |
175 | int status; | |
176 | struct acpi_device *child = NULL; | |
177 | ||
178 | if (device->flags.bus_address) | |
179 | if (device->parent && device->parent->ops.bind) { | |
180 | status = device->parent->ops.bind(device); | |
181 | if (!status) { | |
182 | list_for_each_entry(child, &device->children, node) | |
183 | acpi_pci_bridge_scan(child); | |
184 | } | |
185 | } | |
186 | } | |
187 | ||
b5678a34 | 188 | static int __devinit acpi_pci_root_add(struct acpi_device *device) |
1da177e4 | 189 | { |
4be44fcd LB |
190 | int result = 0; |
191 | struct acpi_pci_root *root = NULL; | |
192 | struct acpi_pci_root *tmp; | |
193 | acpi_status status = AE_OK; | |
27663c58 | 194 | unsigned long long value = 0; |
4be44fcd | 195 | acpi_handle handle = NULL; |
2786f6e3 | 196 | struct acpi_device *child; |
990a7ac5 | 197 | u32 flags; |
1da177e4 | 198 | |
1da177e4 LT |
199 | |
200 | if (!device) | |
d550d98d | 201 | return -EINVAL; |
1da177e4 | 202 | |
36bcbec7 | 203 | root = kzalloc(sizeof(struct acpi_pci_root), GFP_KERNEL); |
1da177e4 | 204 | if (!root) |
d550d98d | 205 | return -ENOMEM; |
c431ada4 | 206 | INIT_LIST_HEAD(&root->node); |
1da177e4 | 207 | |
32917e5b | 208 | root->device = device; |
1da177e4 LT |
209 | strcpy(acpi_device_name(device), ACPI_PCI_ROOT_DEVICE_NAME); |
210 | strcpy(acpi_device_class(device), ACPI_PCI_ROOT_CLASS); | |
db89b4f0 | 211 | device->driver_data = root; |
1da177e4 | 212 | |
1da177e4 LT |
213 | device->ops.bind = acpi_pci_bind; |
214 | ||
990a7ac5 AP |
215 | /* |
216 | * All supported architectures that use ACPI have support for | |
217 | * PCI domains, so we indicate this in _OSC support capabilities. | |
218 | */ | |
219 | flags = OSC_PCI_SEGMENT_GROUPS_SUPPORT; | |
220 | pci_acpi_osc_support(device->handle, flags); | |
221 | ||
1da177e4 LT |
222 | /* |
223 | * Segment | |
224 | * ------- | |
225 | * Obtained via _SEG, if exists, otherwise assumed to be zero (0). | |
226 | */ | |
2d1e0a02 | 227 | status = acpi_evaluate_integer(device->handle, METHOD_NAME__SEG, NULL, |
4be44fcd | 228 | &value); |
1da177e4 LT |
229 | switch (status) { |
230 | case AE_OK: | |
231 | root->id.segment = (u16) value; | |
232 | break; | |
233 | case AE_NOT_FOUND: | |
4be44fcd LB |
234 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
235 | "Assuming segment 0 (no _SEG)\n")); | |
1da177e4 LT |
236 | root->id.segment = 0; |
237 | break; | |
238 | default: | |
a6fc6720 | 239 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _SEG")); |
1da177e4 LT |
240 | result = -ENODEV; |
241 | goto end; | |
242 | } | |
243 | ||
244 | /* | |
245 | * Bus | |
246 | * --- | |
247 | * Obtained via _BBN, if exists, otherwise assumed to be zero (0). | |
248 | */ | |
2d1e0a02 | 249 | status = acpi_evaluate_integer(device->handle, METHOD_NAME__BBN, NULL, |
4be44fcd | 250 | &value); |
1da177e4 LT |
251 | switch (status) { |
252 | case AE_OK: | |
253 | root->id.bus = (u16) value; | |
254 | break; | |
255 | case AE_NOT_FOUND: | |
256 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Assuming bus 0 (no _BBN)\n")); | |
257 | root->id.bus = 0; | |
258 | break; | |
259 | default: | |
a6fc6720 | 260 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BBN")); |
1da177e4 LT |
261 | result = -ENODEV; |
262 | goto end; | |
263 | } | |
264 | ||
265 | /* Some systems have wrong _BBN */ | |
266 | list_for_each_entry(tmp, &acpi_pci_roots, node) { | |
267 | if ((tmp->id.segment == root->id.segment) | |
4be44fcd | 268 | && (tmp->id.bus == root->id.bus)) { |
1da177e4 LT |
269 | int bus = 0; |
270 | acpi_status status; | |
271 | ||
6468463a | 272 | printk(KERN_ERR PREFIX |
a6fc6720 | 273 | "Wrong _BBN value, reboot" |
6468463a | 274 | " and use option 'pci=noacpi'\n"); |
1da177e4 | 275 | |
2d1e0a02 | 276 | status = try_get_root_bridge_busnr(device->handle, &bus); |
1da177e4 LT |
277 | if (ACPI_FAILURE(status)) |
278 | break; | |
279 | if (bus != root->id.bus) { | |
4be44fcd LB |
280 | printk(KERN_INFO PREFIX |
281 | "PCI _CRS %d overrides _BBN 0\n", bus); | |
1da177e4 LT |
282 | root->id.bus = bus; |
283 | } | |
284 | break; | |
285 | } | |
286 | } | |
287 | /* | |
288 | * Device & Function | |
289 | * ----------------- | |
290 | * Obtained from _ADR (which has already been evaluated for us). | |
291 | */ | |
292 | root->id.device = device->pnp.bus_address >> 16; | |
293 | root->id.function = device->pnp.bus_address & 0xFFFF; | |
294 | ||
295 | /* | |
296 | * TBD: Need PCI interface for enumeration/configuration of roots. | |
297 | */ | |
298 | ||
4be44fcd LB |
299 | /* TBD: Locking */ |
300 | list_add_tail(&root->node, &acpi_pci_roots); | |
1da177e4 | 301 | |
4be44fcd LB |
302 | printk(KERN_INFO PREFIX "%s [%s] (%04x:%02x)\n", |
303 | acpi_device_name(device), acpi_device_bid(device), | |
304 | root->id.segment, root->id.bus); | |
1da177e4 LT |
305 | |
306 | /* | |
307 | * Scan the Root Bridge | |
308 | * -------------------- | |
309 | * Must do this prior to any attempt to bind the root device, as the | |
310 | * PCI namespace does not get created until this call is made (and | |
311 | * thus the root bridge's pci_dev does not exist). | |
312 | */ | |
313 | root->bus = pci_acpi_scan_root(device, root->id.segment, root->id.bus); | |
314 | if (!root->bus) { | |
6468463a LB |
315 | printk(KERN_ERR PREFIX |
316 | "Bus %04x:%02x not present in PCI namespace\n", | |
317 | root->id.segment, root->id.bus); | |
1da177e4 LT |
318 | result = -ENODEV; |
319 | goto end; | |
320 | } | |
321 | ||
322 | /* | |
323 | * Attach ACPI-PCI Context | |
324 | * ----------------------- | |
325 | * Thus binding the ACPI and PCI devices. | |
326 | */ | |
327 | result = acpi_pci_bind_root(device, &root->id, root->bus); | |
328 | if (result) | |
329 | goto end; | |
330 | ||
331 | /* | |
332 | * PCI Routing Table | |
333 | * ----------------- | |
334 | * Evaluate and parse _PRT, if exists. | |
335 | */ | |
2d1e0a02 | 336 | status = acpi_get_handle(device->handle, METHOD_NAME__PRT, &handle); |
1da177e4 | 337 | if (ACPI_SUCCESS(status)) |
2d1e0a02 | 338 | result = acpi_pci_irq_add_prt(device->handle, root->id.segment, |
4be44fcd | 339 | root->id.bus); |
1da177e4 | 340 | |
2786f6e3 RZ |
341 | /* |
342 | * Scan and bind all _ADR-Based Devices | |
343 | */ | |
344 | list_for_each_entry(child, &device->children, node) | |
345 | acpi_pci_bridge_scan(child); | |
346 | ||
4be44fcd | 347 | end: |
c431ada4 RS |
348 | if (result) { |
349 | if (!list_empty(&root->node)) | |
350 | list_del(&root->node); | |
1da177e4 | 351 | kfree(root); |
c431ada4 | 352 | } |
1da177e4 | 353 | |
d550d98d | 354 | return result; |
1da177e4 LT |
355 | } |
356 | ||
4be44fcd | 357 | static int acpi_pci_root_start(struct acpi_device *device) |
c431ada4 | 358 | { |
4be44fcd | 359 | struct acpi_pci_root *root; |
c431ada4 | 360 | |
c431ada4 RS |
361 | |
362 | list_for_each_entry(root, &acpi_pci_roots, node) { | |
432bfaba | 363 | if (root->device == device) { |
c431ada4 | 364 | pci_bus_add_devices(root->bus); |
d550d98d | 365 | return 0; |
c431ada4 RS |
366 | } |
367 | } | |
d550d98d | 368 | return -ENODEV; |
c431ada4 | 369 | } |
1da177e4 | 370 | |
4be44fcd | 371 | static int acpi_pci_root_remove(struct acpi_device *device, int type) |
1da177e4 | 372 | { |
4be44fcd | 373 | struct acpi_pci_root *root = NULL; |
1da177e4 | 374 | |
1da177e4 LT |
375 | |
376 | if (!device || !acpi_driver_data(device)) | |
d550d98d | 377 | return -EINVAL; |
1da177e4 | 378 | |
50dd0969 | 379 | root = acpi_driver_data(device); |
1da177e4 LT |
380 | |
381 | kfree(root); | |
382 | ||
d550d98d | 383 | return 0; |
1da177e4 LT |
384 | } |
385 | ||
4be44fcd | 386 | static int __init acpi_pci_root_init(void) |
1da177e4 | 387 | { |
1da177e4 | 388 | if (acpi_pci_disabled) |
d550d98d | 389 | return 0; |
1da177e4 | 390 | |
1da177e4 | 391 | if (acpi_bus_register_driver(&acpi_pci_root_driver) < 0) |
d550d98d | 392 | return -ENODEV; |
1da177e4 | 393 | |
d550d98d | 394 | return 0; |
1da177e4 LT |
395 | } |
396 | ||
397 | subsys_initcall(acpi_pci_root_init); |